Inner cap with adjustable fit and hold that can be adjusted (head circumference) (capacity). Velcro closure for tightening adjustment: The cover conforms to curved surfaces, and the back rise is different from the previous level. There is no extra cloth for the head and no stiffness. Side-tuck design provides a secure hold under the ear. The back part is reinforced with a core for a comfortable fit and enhanced durability. The double stitching strengthens the tightness and provides an excellent fit. If you do not match the size of the users head size, it will not hold it firmly. Many products do not fit the actual head size, so it is not possible to slide inside the helmet. This is an original Kraft-modified inner cap with a size adjustment type that does not exist from other companies. Please use it once. This product is mainly used as a "helmet innerwear," and it also adapts to the tastes of users.